1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
// (C) Copyright 2005-2007 Jonathan Turkanis
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
// See http://www.boost.org/libs/iostreams for documentation.
#ifndef BOOST_IOSTREAMS_TEE_HPP_INCLUDED
#define BOOST_IOSTREAMS_TEE_HPP_INCLUDED
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/assert.hpp>
#include <boost/config.hpp> // BOOST_DEDUCE_TYPENAME.
#include <boost/iostreams/categories.hpp>
#include <boost/iostreams/detail/adapter/device_adapter.hpp>
#include <boost/iostreams/detail/adapter/filter_adapter.hpp>
#include <boost/iostreams/detail/call_traits.hpp>
#include <boost/iostreams/detail/execute.hpp>
#include <boost/iostreams/detail/functional.hpp> // call_close_all
#include <boost/iostreams/operations.hpp>
#include <boost/iostreams/pipeline.hpp>
#include <boost/iostreams/traits.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/is_same.hpp>
namespace boost { namespace iostreams {
//
// Template name: tee_filter.
// Template parameters:
// Device - A blocking Sink.
//
template<typename Device>
class tee_filter : public detail::filter_adapter<Device> {
public:
typedef typename detail::param_type<Device>::type param_type;
typedef typename char_type_of<Device>::type char_type;
struct category
: dual_use_filter_tag,
multichar_tag,
closable_tag,
flushable_tag,
localizable_tag,
optimally_buffered_tag
{ };
BOOST_STATIC_ASSERT(is_device<Device>::value);
BOOST_STATIC_ASSERT((
is_convertible< // Using mode_of causes failures on VC6-7.0.
BOOST_DEDUCED_TYPENAME iostreams::category_of<Device>::type, output
>::value
));
explicit tee_filter(param_type dev)
: detail::filter_adapter<Device>(dev)
{ }
template<typename Source>
std::streamsize read(Source& src, char_type* s, std::streamsize n)
{
std::streamsize result = iostreams::read(src, s, n);
if (result != -1) {
std::streamsize result2 = iostreams::write(this->component(), s, result);
(void) result2; // Suppress 'unused variable' warning.
BOOST_ASSERT(result == result2);
}
return result;
}
template<typename Sink>
std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
{
std::streamsize result = iostreams::write(snk, s, n);
std::streamsize result2 = iostreams::write(this->component(), s, result);
(void) result2; // Suppress 'unused variable' warning.
BOOST_ASSERT(result == result2);
return result;
}
template<typename Next>
void close(Next&, BOOST_IOS::openmode)
{
detail::close_all(this->component());
}
template<typename Sink>
bool flush(Sink& snk)
{
bool r1 = iostreams::flush(snk);
bool r2 = iostreams::flush(this->component());
return r1 && r2;
}
};
BOOST_IOSTREAMS_PIPABLE(tee_filter, 1)
//
// Template name: tee_device.
// Template parameters:
// Device - A blocking Device.
// Sink - A blocking Sink.
//
template<typename Device, typename Sink>
class tee_device {
public:
typedef typename detail::param_type<Device>::type device_param;
typedef typename detail::param_type<Sink>::type sink_param;
typedef typename detail::value_type<Device>::type device_value;
typedef typename detail::value_type<Sink>::type sink_value;
typedef typename char_type_of<Device>::type char_type;
typedef typename
mpl::if_<
is_convertible<
BOOST_DEDUCED_TYPENAME
iostreams::category_of<Device>::type,
output
>,
output,
input
>::type mode;
BOOST_STATIC_ASSERT(is_device<Device>::value);
BOOST_STATIC_ASSERT(is_device<Sink>::value);
BOOST_STATIC_ASSERT((
is_same<
char_type,
BOOST_DEDUCED_TYPENAME char_type_of<Sink>::type
>::value
));
BOOST_STATIC_ASSERT((
is_convertible<
BOOST_DEDUCED_TYPENAME iostreams::category_of<Sink>::type,
output
>::value
));
struct category
: mode,
device_tag,
closable_tag,
flushable_tag,
localizable_tag,
optimally_buffered_tag
{ };
tee_device(device_param device, sink_param sink)
: dev_(device), sink_(sink)
{ }
std::streamsize read(char_type* s, std::streamsize n)
{
BOOST_STATIC_ASSERT((
is_convertible<
BOOST_DEDUCED_TYPENAME iostreams::category_of<Device>::type, input
>::value
));
std::streamsize result1 = iostreams::read(dev_, s, n);
if (result1 != -1) {
std::streamsize result2 = iostreams::write(sink_, s, result1);
(void) result1; // Suppress 'unused variable' warning.
(void) result2;
BOOST_ASSERT(result1 == result2);
}
return result1;
}
std::streamsize write(const char_type* s, std::streamsize n)
{
BOOST_STATIC_ASSERT((
is_convertible<
BOOST_DEDUCED_TYPENAME iostreams::category_of<Device>::type, output
>::value
));
std::streamsize result1 = iostreams::write(dev_, s, n);
std::streamsize result2 = iostreams::write(sink_, s, n);
(void) result1; // Suppress 'unused variable' warning.
(void) result2;
BOOST_ASSERT(result1 == n && result2 == n);
return n;
}
void close()
{
detail::execute_all( detail::call_close_all(dev_),
detail::call_close_all(sink_) );
}
bool flush()
{
bool r1 = iostreams::flush(dev_);
bool r2 = iostreams::flush(sink_);
return r1 && r2;
}
template<typename Locale>
void imbue(const Locale& loc)
{
iostreams::imbue(dev_, loc);
iostreams::imbue(sink_, loc);
}
std::streamsize optimal_buffer_size() const
{
return (std::max) ( iostreams::optimal_buffer_size(dev_),
iostreams::optimal_buffer_size(sink_) );
}
private:
device_value dev_;
sink_value sink_;
};
template<typename Sink>
tee_filter<Sink> tee(Sink& snk)
{ return tee_filter<Sink>(snk); }
template<typename Sink>
tee_filter<Sink> tee(const Sink& snk)
{ return tee_filter<Sink>(snk); }
template<typename Device, typename Sink>
tee_device<Device, Sink> tee(Device& dev, Sink& sink)
{ return tee_device<Device, Sink>(dev, sink); }
template<typename Device, typename Sink>
tee_device<Device, Sink> tee(const Device& dev, Sink& sink)
{ return tee_device<Device, Sink>(dev, sink); }
template<typename Device, typename Sink>
tee_device<Device, Sink> tee(Device& dev, const Sink& sink)
{ return tee_device<Device, Sink>(dev, sink); }
template<typename Device, typename Sink>
tee_device<Device, Sink> tee(const Device& dev, const Sink& sink)
{ return tee_device<Device, Sink>(dev, sink); }
} } // End namespaces iostreams, boost.
#endif // #ifndef BOOST_IOSTREAMS_TEE_HPP_INCLUDED
|
